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/*
* Copyright (C) 2007 The Guava Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.glassfish.jersey.internal.guava;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
/**
* Implementation of {@link Multimap} using hash tables.
*
*
The multimap does not store duplicate key-value pairs. Adding a new
* key-value pair equal to an existing key-value pair has no effect.
*
*
Keys and values may be null. All optional multimap methods are supported,
* and all returned views are modifiable.
*
*
This class is not threadsafe when any concurrent operations update the
* multimap. Concurrent read operations will work correctly. To allow concurrent
* update operations, wrap your multimap with a call to {@link
* Multimaps#synchronizedSetMultimap}.
*
* @author Jared Levy
* @since 2.0 (imported from Google Collections Library)
*/
public final class HashMultimap extends AbstractSetMultimap {
private static final int DEFAULT_VALUES_PER_KEY = 2;
private static final long serialVersionUID = 0;
private transient int expectedValuesPerKey = DEFAULT_VALUES_PER_KEY;
private HashMultimap() {
super(new HashMap>());
}
/**
* Creates a new, empty {@code HashMultimap} with the default initial
* capacities.
*/
public static HashMultimap create() {
return new HashMultimap();
}
/**
* {@inheritDoc}
*
*
Creates an empty {@code HashSet} for a collection of values for one key.
*
* @return a new {@code HashSet} containing a collection of values for one key
*/
@Override
Set createCollection() {
return Sets.newHashSetWithExpectedSize(expectedValuesPerKey);
}
/**
* @serialData expectedValuesPerKey, number of distinct keys, and then for
* each distinct key: the key, number of values for that key, and the
* key's values
*/
private void writeObject(ObjectOutputStream stream) throws IOException {
stream.defaultWriteObject();
stream.writeInt(expectedValuesPerKey);
Serialization.writeMultimap(this, stream);
}
private void readObject(ObjectInputStream stream)
throws IOException, ClassNotFoundException {
stream.defaultReadObject();
expectedValuesPerKey = stream.readInt();
int distinctKeys = Serialization.readCount(stream);
Map> map = Maps.newHashMapWithExpectedSize(distinctKeys);
setMap(map);
Serialization.populateMultimap(this, stream, distinctKeys);
}
}